20404012502051 has 2 divisors, whose sum is σ = 20404012502052. Its totient is φ = 20404012502050.

The previous prime is 20404012502023. The next prime is 20404012502099. The reversal of 20404012502051 is 15020521040402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20404012502051 - 2³⁴ = 20386832632867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20404012502051.

It is not a weakly prime, because it can be changed into another prime (20404012562051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202006251025 + 10202006251026.

It is an arithmetic number, because the mean of its divisors is an integer number (10202006251026).

Almost surely, 2^{20404012502051} is an apocalyptic number.

20404012502051 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404012502051 is an equidigital number, since it uses as much as digits as its factorization.

20404012502051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 20404012502051 its reverse (15020521040402), we get a palindrome (35424533542453).

The spelling of 20404012502051 in words is "twenty trillion, four hundred four billion, twelve million, five hundred two thousand, fifty-one".